Document And Entity Information
3 Months Ended
Mar. 31, 2012
Apr. 27, 2012
Document And Entity Information [Abstract]    
Entity Registrant Name ST JOE CO  
Entity Central Index Key 0000745308  
Document Type 10-Q  
Document Period End Date Mar. 31, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   92,278,431